Influence of NaOH and Ni catalysts on hydrogen production from the supercritical water gasification of dewatered sewage sludge |
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| Affiliation: | 1. College of Environment, Hohai University, Nanjing 210098, PR China;2. National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Hohai University, Nanjing, Jiangsu 210098, PR China;1. State Key Laboratory of Multiphase Flow in Power Engineering, Xi''an Jiaotong University, Xi''an 710049, China;2. Queensland Micro- and Nanotechnology Center, Nathan Campus, Griffith University, Brisbane 4111, Australia;3. School of Mechanical and Mining Engineering, The University of Queensland, St Lucia, QLD 4072, Australia;4. Centre for Computational Molecular Science, AIBN, The University of Queensland, St Lucia, QLD 4072, Australia;1. Residues and Resource Reclamation Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore;2. Division of Environmental and Water Resources Engineering, School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;3. School of Chemical and Biomedical Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;4. School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin, Heilongjiang 150090, China;1. State Key Laboratory of Multiphase Flow in Power Engineering, Xi''an Jiaotong University, Xi''an 710049, Shaanxi, China;2. School of Mechanical and Mining Engineering, University of Queensland, St Lucia, QLD 4072, Australia;3. Australian Institute for Bioengineering and Nanotechnology, University of Queensland, St Lucia, QLD 4072, Australia;4. School of Natural Sciences and Queensland Micro- and Nanotechnology Center, Nathan Campus, Griffith University, Brisbane 4111, Australia |
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| Abstract: | Dewatered sewage sludge was treated with NaOH additive and Ni catalyst in supercritical water in a high-pressure autoclave to examine the effects of separate and combined NaOH additive and Ni catalyst on hydrogen generation. The effects of Ni/NaOH ratio on hydrogen production were also investigated to identify possible catalytic mechanism and interactions. NaOH and Ni, separately or in combination, improved the hydrogen production and hydrogen gasification efficiency. The addition of NaOH additive not only promoted the water–gas shift reaction, but also favored H2 generation of Ni catalyst by capturing CO2. The hydrogen yield of combined catalysts with different Ni/NaOH ratios was higher than the theoretical sum of hydrogen yield from the mixture by 10–33%. The largest hydrogen yield, of 4.8 mol per kilogram of organic matter, which was almost five times as much as without catalyst, was achieved with the addition of 3.33 wt% Ni and 1.67 wt% NaOH. The combined NaOH additive and Ni catalyst also improved the gasification of several other dewatered sewage sludges, increasing the hydrogen yield by four to twelve times that seen without catalyst. Combined NaOH additive and Ni catalyst are effective in dewatered sewage sludge gasification at low temperature. |
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| Keywords: | Hydrogen production Reduced nickel powder Sodium hydroxide Co-catalysis Sewage sludge |
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